Butane - ethane - methane - propane: what do these hydrocarbons have in common? a) the same number of carbons present. b) they all have polar covalent bonds. c) they all have single covalent bonds. d) they have the same structural formulas.

C) They all have single covalent bonds.

Explanation:

The given hydrocarbons Butane,Ethane,Methane,Propane belongs to alkane group.

In alkane group consists of hydrogen and carbon in which carbon_carbon bonds are single and carbon_hydrogen bond is also single.

The elements of this group makes bond by sharing of electrons that means they form single covalent bond.

Butane have 4 , Ethane has 2, Methane has 1, and Propane has 3 carbon atoms.

Since they have different number of carbon atoms so their structural formula also differs.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.